import axios from 'axios';
import { ElNotification, ElMessageBox, ElMessage, ElLoading } from 'element-plus';
import { saveAs } from 'file-saver';
import store from '@/store';
import { getToken } from '@/utils/token';
import errorCode from '@/utils/errorCode';
import { isBlobData } from '@/utils/common';
import { encodeURIParams } from '@/utils/strUtil';
import cache from '@/plugins/cache';

let downloadLoadingInstance;
// 是否显示重新登录
export const isReLogin = { show: false };

axios.defaults.headers['Content-Type'] = 'application/json;charset=utf-8';
// 创建axios实例
const service = axios.create({
  // axios中请求配置有baseURL选项，表示请求URL公共部分
  baseURL: import.meta.env.VITE_APP_BASE_API,
  // 超时
  timeout: 10000,
});

// request拦截器
service.interceptors.request.use(
  (config) => {
    // 是否需要设置 token
    const isToken = (config.headers || {}).isToken === false;
    // 是否需要防止数据重复提交
    const isRepeatSubmit = (config.headers || {}).repeatSubmit === false;
    if (getToken() && !isToken) {
      config.headers.Authorization = `Bearer ${getToken()}`; // 让每个请求携带自定义token 请根据实际情况自行修改
    }
    // get请求映射params参数
    if (config.method === 'get' && config.params) {
      let url = `${config.url}?${encodeURIParams(config.params)}`;
      url = url.slice(0, -1);
      config.params = {};
      config.url = url;
    }
    if (!isRepeatSubmit && (config.method === 'post' || config.method === 'put')) {
      const requestObj = {
        url: config.url,
        data: typeof config.data === 'object' ? JSON.stringify(config.data) : config.data,
        time: new Date().getTime(),
      };
      const sessionObj = cache.session.getJSON('sessionObj');
      if (sessionObj === undefined || sessionObj === null || sessionObj === '') {
        cache.session.setJSON('sessionObj', requestObj);
      } else {
        const s_url = sessionObj.url; // 请求地址
        const s_data = sessionObj.data; // 请求数据
        const s_time = sessionObj.time; // 请求时间
        const interval = 1000; // 间隔时间(ms)，小于此时间视为重复提交
        if (s_data === requestObj.data && requestObj.time - s_time < interval && s_url === requestObj.url) {
          const message = '数据正在处理，请勿重复提交';
          console.warn(`[${s_url}]: ${message}`);
          return Promise.reject(new Error(message));
        }
        cache.session.setJSON('sessionObj', requestObj);
      }
    }
    return config;
  },
  (error) => {
    console.log(error);
    Promise.reject(error);
  },
);

// 响应拦截器
service.interceptors.response.use(
  (res) => {
    // 未设置状态码则默认成功状态
    const code = res.data.code || 200;
    // 获取错误信息
    const msg = errorCode[code] || res.data.msg || errorCode.default;
    // 二进制数据则直接返回
    if (res.request.responseType === 'blob' || res.request.responseType === 'arraybuffer') {
      return res.data;
    }
    if (code === 20101) {
      if (!isReLogin.show) {
        isReLogin.show = true;
        ElMessageBox.confirm('登录状态已过期，您可以继续留在该页面，或者重新登录', '系统提示', {
          confirmButtonText: '重新登录',
          cancelButtonText: '取消',
          type: 'warning',
        })
          .then(() => {
            isReLogin.show = false;
            store.dispatch('LogOut').then(() => {
              location.href = '/index';
            });
          })
          .catch(() => {
            isReLogin.show = false;
          });
      }
      return Promise.reject('无效的会话，或者会话已过期，请重新登录。');
    }
    if (code === 500) {
      ElMessage({
        message: msg,
        type: 'error',
      });
      return Promise.reject(new Error(msg));
    }
    if (code !== 200) {
      ElNotification.error({
        title: msg,
      });
      return Promise.reject('error');
    }
    return Promise.resolve(res.data.data);
  },
  (error) => {
    console.log(`err${error}`);
    let { message } = error;
    if (message == 'Network Error') {
      message = '后端接口连接异常';
    } else if (message.includes('timeout')) {
      message = '系统接口请求超时';
    } else if (message.includes('Request failed with status code')) {
      message = `系统接口${message.substr(message.length - 3)}异常`;
    }
    ElMessage({
      message,
      type: 'error',
      duration: 5 * 1000,
    });
    return Promise.reject(error);
  },
);

// 通用下载方法
export function download(url, params, filename) {
  downloadLoadingInstance = ElLoading.service({ text: '正在下载数据，请稍候', background: 'rgba(0, 0, 0, 0.7)' });
  return service
    .post(url, params, {
      transformRequest: [(params) => encodeURIParams(params)],
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      responseType: 'blob',
    })
    .then(async (data) => {
      const isLogin = await isBlobData(data);
      if (isLogin) {
        const blob = new Blob([data]);
        saveAs(blob, filename);
      } else {
        const resText = await data.text();
        const rspObj = JSON.parse(resText);
        const errMsg = errorCode[rspObj.code] || rspObj.msg || errorCode.default;
        ElMessage.error(errMsg);
      }
      downloadLoadingInstance.close();
    })
    .catch((r) => {
      console.error(r);
      ElMessage.error('下载文件出现错误，请联系管理员！');
      downloadLoadingInstance.close();
    });
}

export default service;
